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Amplifier

a technology for amplifiers and amplifiers, applied in amplifiers, amplifiers with coupling networks, amplifiers with semiconductor devices/discharge tubes, etc., can solve the problems of increasing transmission losses, low amplifier efficiency, and miniaturization of devices

Active Publication Date: 2009-02-19
NEC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0018]Heretofore, there has been a package containing two transistors for a push-pull amplifier or a balance amplifier, but in the present invention, one transistor in this package is operated as

Problems solved by technology

In general, the efficiency of the amplifier is low.
This has been disadvantageous in advancing miniaturization of a device.
Moreover, since two amplifiers are separately disposed, the transmission line lengthens which extends from each amplifier output to the signal combining point, transmission losses increases, and the efficiency of the whole amplifier is lowered.
The structure is also disadvantageous in reducing costs of the device.

Method used

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  • Amplifier
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Embodiment Construction

[0023]An embodiment of the present invention will be described hereinafter with reference to the accompanying drawings. FIG. 1 is a constitution diagram showing an example of an amplifier of the present invention.

[0024]Referring to the drawing, the amplifier of the present invention has: a carrier amplifier 21 that performs a signal amplifying operation at all times; a peak amplifier 22 that operates only at a time of the outputting of a high electric power; a combiner 23 that combines and outputs the outputs from the carrier amplifier 21 and the peak amplifier 22; and a distributor 24 that distributes an input signal to the carrier amplifier 21 and the peak amplifier 22. The carrier amplifier 21 and the peak amplifier 22 are included in a single package 1 (a single package transistor). This amplifier amplifies a signal to be amplified input from an input end.

[0025]In the carrier amplifier 21, an amplifier biased in an AB-class or a B-class is usually used. Moreover, the peak amplif...

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Abstract

An amplifier includes a carrier amplifier which performs signal amplification at all times, a peak amplifier which operates only at a time when the high electric power is outputted, a combiner which combines the output from the carrier amplifier and the peak amplifier, and a distributor which distributes an input signal to the carrier amplifier and the peak amplifier. The carrier amplifier and the peak amplifier are included in a single package transistor.

Description

RELATED APPLICATIONS[0001]The present application is a Continuation Application of U.S. patent application Ser. No. 10 / 572,065 which was filed on Mar. 15, 2006 and is incorporated by reference herein.TECHNICAL FIELD[0002]The present invention relates to an amplifier, and in particular, to an amplifier in which a liner amplifier and a nonlinear amplifier are used together to perform amplification.BACKGROUND ART[0003]In a power amplifier for use in a radio communication system, linearity and high efficiency are required. Especially, in recent years, there is often handled a signal having an average value of signal amplitudes which is largely different from a maximum amplitude in a multi-valued digital modulation communicating system or the like. In a case where such signal is amplified with a conventional power amplifier, the amplifier is set to an operation point at which the signal can be amplified to the maximum amplitude without straining the signal. Therefore, there is little tim...

Claims

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Application Information

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IPC IPC(8): H03F3/68
CPCH03F1/0288H03F2200/451H03F3/602
Inventor SHIIKUMA, KAZUMI
Owner NEC CORP